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In the tree view, click Piping > Piping Specification > Piping Materials Classes.
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In the Piping Materials Classes branch, open a specification and click Piping Materials Class Rules > Clamp Selection Filter.
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Click the Insert Row Command to insert a blank row in the grid view.
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Define the clamp selection filter by providing appropriate values in the different columns.
The Clamp Selection Filter sheet in the workbook corresponds to the Clamp Selection Filter node in the Catalog task. See Piping Reference Data.